Sprayer



March 29, 1932.

K. A. HUDSDN SPRAYER :0 Inventor KENNETH A. Huas 0N Fig. 2 QY$- J M Attorneys Patented Mar. 29', 1932 a I UNITED STATES PATENT OFFICE mm A. HUDSON, OI MINNEAPOLIS, MINNESOTA, ASSIGNOB TO H. D. HUDSON IANUIACT'URING COIIAN'Y, OF MINNEAPOLIS, MINNESOTA, A CORPORATION 01' IINNESO'I'L Application filed April 7,

This invention relates to improvements in sprayers of the type in which an air pump is arranged upon the supply tank, and pressure is put upon the fluid in the supply tank to cause it to be delivered outwardly through a spraying tube.

One of the objections to the ordinary devices as now constructed is that the pressure applied to the liquid in the supply tank often causes it to splash into the pressure chamber of the air pressure supply device, resulting in clogging of the valve or valves, and collection and incrustation in such quantity as to seriously interfere with the proper operation of the apparatus. It is, therefore,

an object of this invention to provide a guard element which will substantially prevent ent of fluid in the manner mentioned, but

w liich will not interfere with the suflicient distribution of pressure. Another object is to provide a construction whereby the spray delivery tube is passed through the guard element, and assists in supportingsaid element in operative position before connection of the pump cylinder to the supply tank, (which connection is convenientl made by providing a threaded socket in t e cylinder wall 00- opglgtive with the projection of the supply Another objectionto the ordinary devices now constructed is that leaking through the spray tube takes place after use, due to residual pressure. An object of this invention is, therefore, to provide means for relieving this residual pressure, the said means comprising in this instance a valve,"operable from a point exteriorly of the apparatus, and in this instance, placed upon the top part of the cy]in- 4o der over the compression chamber, and over cation between the pressure chamber and the supply tank.

I pointed out in the description of the drawsaid drawmgs:

Figure l is a vertical fragmentary section illustrating the connection of the cylinder with the tank and showing the relation of the spray delivering tube and guard;

or aligned with the line of pressure communi- Advantages of the various devices will be p ings forming a part ofthis application and in.

SPBAYEB 1928. Serial No. 288,225.

Figure 2 is a fra enta to Ian section. of the detached pum p cylinder? p The numeral 1 indicates the supply tank hav ng a threaded tubular or hollow proection 2, having a top flange 3 defining a relatlvely large filler opening 4. In threaded engagement with this projection is a socket piece 5, let into the side of the cylinder 10, and sultably secured as by soldering. The bottom of this socket 5 has a flange 7 defining a relatively large opening 8, which with the opening 4, establishes communication between the cylinder pressure chamber and the tank, This pressure chamber is formed by partltioning the forward portion of the pump cylinder or barrel by element 12, thus separating it fromthe piston chamber 13. A portion of the piston is indicated at 14: and it will be understood that there is the proper operating means for the piston, the device being of the force pump type. A check valve 6 opens into the pressure chamber, andoperates in a tubular casing which, to make for compactness, overlies the openlngs 4. and 8, and therefore, heretofore was submitted to splashings from the supply tank. The valve is shown in open position as on the forward stroke of the piston. As before stated, during the application of pressure upon the top of the liquid in the supplytank, spattering of paint, for example, took place upwardly into the pressure chamber 11 and caused the valve 6 to stick, the valve 6 being located in the pressure delivery chamber, so that a maximum compression stroke of the piston may be had. The present invention, therefore provides, among other ;things, means for preventing this upward spraying of the liquid into the compression chamber, but permitting the establishment of, sufiicient pressure communi-' cation between the chamber 11 and the sup- 1 tank. This means comprises a guard plate 25 arranged across the opening within the socket piece 5 and abutting the flange. A gasket 20,'the ordinary one, is placed against the guard plate and when the parts are screwed together the gasket is compressed as shown. The guard plate has a relatively small opening 21, and in this instance the opening is -elo ted in a direction at right les to the li i s of the cylinder. This is a eature of the invention, although there is no intention to be limited in this regard. The spray tube is indicated at 22 and 1S suitably secured as at 23 to deliver outwardly at the end of the cylinder. The other end projects throu h the opening 21 and downwardly into the liquid of the tank 1. The mode of connecting this tube forms no part of the invention, except insofar as it is arranged to engage one ed e of the opening as at 26, with the tube un er tension. By this means the tube acts to secure the guard late against detachment when the pump cy inder is detached from the tank or before attachment thereto. At the same time a large opening 4 is provided so that the tube can be easily insorted into the tank. It will be understood that the tube is generally secured as at 23 and that afterwards the cylinder is screwed into position on the tank. The use of the guard plate, as well as the manner of attaching it are features of the invention.

Another feature of the invention is the provision of a valvefor releasing pressure in the chamber. The chamber in this instance comprises a casing suitably secured radially with respect to the axis and extendthrough the wall of the cylinderg The v ve cylinder has a central partition 1 having an o ening 32 therein, and a valve stem 33 is sli ably arranged through the opening and has a head 34 as a valve engaging against the partition 31 as a seat. The diameter of the head is less than the internal diameter of the tubular member 31 so that the air may pass outwardly when the valve is depressed. To further facilitate the passage of air, openings 37 are provided, as well as an opening 38 at the upper outer side of the tube. The tube 30 is in alignment with the axes of openings 4, 21, 8. This opening 38 is provided so that when the button 39 of the stem engages the upper surface 40 of the casing or tube 30, the free outward passage of air is not interfered with. A spring 41 acts between the button 38 and the partition 31 to hold the valve in closed position. This use of this pressure relief means is a feature of the invention, and is for the purpose of relieving pressure in the chamber to prevent leaking through the tube, when the device is not in use.

To illustrate the utility of the valve for releasing residual pump pressure. In a device 1 of this kind several strokes of the piston are required to develop the proper operating pressure. When the operator desires to discontinue spraying, the pressure that has been created continues -to cause the liquid to be discharged from the nozzle, and this residual pressure acts for quite an interval of time and the pressure is ordinarily only gradually reduced. Therefore, there is considerable wasting or seepage of liquid. With the present invention this lpressure can be instantly relieved at the wil of the operator, thereby causing immediate cessation of the spray.

I claim as my invention:

1. A spraying apparatus comprising a supply tank, an air pump cylinder removably secured to the tan ,said tank and cylinder each having arelatively large opening, the said openings arranged to establish communication between the cylinder and tank, a guard plate interposed between the openings and having a relatively small opening, and a spray delivery tube secured in the cylinder 'cynnder and extending through the guard opening into the supply tank, in a manner to removably secure the guard to the cylinder after removal of the cylinder from the tank.

3. An air pump cylinder having a socket adapted to be removably attached to a supply tank, said socket having a relatively large opening therein, a guard plate within the socket across the opening and having an opening of relatively small size, and a supply tube secured in the cylinder and engaged in the guard opening to secure said guard against the socket in operative position, the opening being slightly larger than that portion of the tube which passes through it, and said opening being elongated in a direction substantially at right angles to the axis of the cylinder.

4. A supply tank having an attaching projection having an opening in its end wall a pump cylinder having a socket in threaded engagement with the tank projection, said socket having an opening, both openings being of relatively large size, and a guard plate arranged between the openings, and secured by projection and socket, and having an opening of relatively small size, a spray tube secured to the cylinder and passing through all openings and engaging the marin of the uard opening, the arrangement eing such t at the larger openings permit of facile introduction of the tube into the tank, and the guard plate substantially prevents entry of liquid into the cylinder, the arrangement further being such'that when the cylinder is detached the plate is held against detachment from the socket.

5. A spraying'apparatus comprising a supply tank having a relatively large filling opening, an air pump including a cylinder having access to the pressure chamber and valve, and

said cylinder being removably secured to the tank so that the openings of cylinder and tank are opposingly arranged to establish communication, a discharge pipe arranged to deliver outwardly through the end wall of the cylinder and passing through the openings into the tank, and a guard plate arranged between the tank filler and cylinder openings, and having a relatively small opening, said tube being engaged with the plate in a manner to removably secure it for removal with the cylinder.

6. A spraying apparatus comprising a supply tank having a relatively large filling opening, an air pump including a cylinder having an end wall, and a partition dividing the cylinder into piston and pressure chambers, said wall having acheck valve opening into and accessible from the pressure chamber side of the partition, and said cylinder further having an opening sufliciently large to permit ac cess to the pressure chamber and valve, and said cylinder being removably secured to the tank so that the openings of cylinder and tank are opposingly arranged for communication, a residual pressure relief valve arranged on the cylinder to be acessible for repair through the openings when the cylinder 1s removed, a discharge pipe arranged to deliver outwardly through the end wall of the cylinder and f passing through the openings into the tank, a

guard plate arranged between the tank filler and cylinder openings, and said plate having a relatively small opening, said tube being engaged with the plate in a manner to removably secure it for removal with the cylinder.

7. A spraying apparatus comprising a'supply tank, an air pump cylinder mounted on the tank, said tank and cylinder each having a relatively large opening with the o enings arranged toestablish communication tween the cylinder and tank, a guard plate interfrom the pressure chamber through the opening of cylinder guard plate and tank and into sa1d tank, said guard opening being of greater area than the tube.- V

9. A spraying apparatus comprising a supply tank, an air pump 0 linder detachably connected to the tank, sai tank and cylinder having openings opposed to establish communication between cylinder and tank and of a size to facilitate access to both, said cylinder having a pressure chamber in opposition to said openings, a valve in the pressure chamber, a guard plate interposed between the openings and having a relatively small opening, and a spray delivery tube passing from the pressure chamber through the opening of cylinder ard plate and tank and into said tank, sai guard opening bein of greater area than the tube, andsaid tu e being engaged with the margin of said guard opening in a manner to releasably secure the guard for removal with the cylinder.

10. A supply tank having a threaded tubular filler extension, a cylinder having a partition dividing it into pressure and piston chambers, a cylindrical wall of said pressure chamextensions being of a size to facilitate access to cylinder and tank, a valve in the pressure chamber accessible through the cylinder extension, a plate arranged across the tubular extensions and having a relativelysmall opening, and a spray delivery tube passing from posedbetween the openings and havin a relatively small opening, and a spray delivery tube secured in the cylinder and extending loosely through said plate opening and into the supply tank, and means removably securing the pump cylinder to the tank.

8. A spraying apparatus comprising a supply tank, an air pump cylinder detachably connected to the tank, said tank and cylinder having openings opposed to establish communication between cylinder and tank and of a size to facilitate access to both, said cylinder having a pressure chamber in opposition to saidopenings, a valve in the ressure chamber, a guard plate interposed etween the openings and having a relatively small opening, and a spray. delivery tube passing 

